N = int(input())
A, B = map(int,input().split())
ans = -1
T = list(map(int,input().split()))

for i in range(N):
	if T[i] & 1:
		A -= 1
	if T[i] & 2:
		B -= 1
	
	if A < 0 or B < 0:
		ans = i+1 
		break
	
print(ans)